Double bottom construction for vessels



March 19, 1957 w. e. BARTENFELD DOUBLE BOTTOM CONSTRUCTION FOR VESSELS Filed March 9, 1955 d L k n e t r a G m rm L m @Www United States Patent 0 DOUBLE BOTTOM CONSTRUCTION FOR VESSELS Wilford G. Bartenfeld, Cleveland, Ohio Application March 9, 1955, Serial No. 493,186

1 Claim. (Cl. 114-79) This invention relates to double bottom construction for vessels, and has for its main object to provide a double bottom especially for bulk-cargo carrying vessels and possessing great rigidity and strength.

Another object of the invention is to use in said construction, inverted channels extending transversely to form the top of the double bottom, and supporting every other channel between their flanges upon transverse floor plates, and the channels not so supported, upon stringers supported by said floor plates.

With the above and other objects in view as will be readily understood, the invention will be fully described in accordance with the accompanying drawings, and the novel features thereof will be distinctly pointed out in the appended claim.

In the drawings similar characters of reference indicate corresponding parts.

Figure .1 is a transverse cross-sectional view of onehalf of a vessel through the web of an inverted channel forming the tank top as constructed in accordance with my invention,

Fig. 2 is a plan view of Fig. 1,

Fig. 3 is a portion of a longitudinal view of the vessel taken on line 33 of Fig. 1,

Fig. 4 is a plan view assembly, on an enlarged scale, of a portion of a floor plate, a stiffener and a stringer supported thereby and by the floor plate, as seen below the inverted channels,

Fig. 5 is a similar view of the center keelson and the floor plates extending transversely from opposite sides thereof, and

Fig. 6 is a fragmental longitudinal view taken on line 66 of Fig. 1, showing the center keelson and a floor plate extending therefrom, and the inverted channels sup ported thereby.

Referring to the accompanying drawings wherein like characters of reference designate corresponding parts, 1 represents the usual bottom shell plating and 2 the side shell plating of a bulk-cargo carrying vessel. The side shell plating is supported by upright channel frames 3. The center keelson, indicated by 4, extending longitudinally of the vessel is welded at 5 to the bottom shell plating. Extending outboard in transverse alinement from the opposite sides of the center keelson 4 to each side shell plating 2 are the floor plates indicated by 6 at one side of said keelson and by 7 at the other side thereof, and said floor plates are welded to said keelson at 8. A margin plate, as indicated at 9, is supported upon the top edge of each outboard or bilge end 10 of the floor plates 6 and 7 and is welded thereto at 11. Bilge brackets, as indicated at 12, are welded to the top sides of the margin plates 9 and to the side shell frames 3.

The top of the double bottom of the vessel is constructed of inverted standard channels 13 which extend transversely from one margin plate 9 to the other, and the flanges 14 of said channels are in side-by-side contact and the joints between same at 15 are welded. A connecting plate 16 covers the joint 17 between the outboard ends of the inverted channels 13 forming the double bottom and the margin plate 9, and all joints between said parts are welded.

The transverse alining floor plates 6 and 7 are uni- "ice formly spaced apart from fore to aft or longitudinally for supporting every other one of said transverse inverted channels 13 under their webs approximately centrally between their flanges and welding said channels to said floor plates at 18. The top edge of the center keelson 4, fore and aft of the contacting floor plates 6 and 7, is provided with transverse notches 19 and 20 for accommodating the 'side-by-side flanges 14 of the transverse inverted channels 13 with their webs resting upon the center keelson, and all contacting parts at said joints are welded.

For strengthening and giving greater rigidity to the floor plates 6 and 7 extending transversely from the opposite sides of the center keelson 4 in order to support the transverse inverted channels 13 resting thereupon and more especially those channels in between and not so supported, vertical angle stifieners 21 are placed at uniform distances apart from said keelson to each side shell plating 2 and extend from the bottom shell plating 1 to the underside of the webs of said channels. The angle stifleners 21 are welded at 22 to the floor plates. For supporting the transverse inverted channels 13 positioned between those channels supported upon the floor plates 6 c;nd 7, bar stringers 23 having their upper edges notched transversely at 24 and 25 for receiving the side-by-side flanges 14 of said channels are employed. The top edges of the floor plates 6 at one side of the center keelson and 7 at the other side thereof are provided with longitudinally alining notches 26 in alinement with the flanges 27 of the stiffeners 21 for receiving the bar stringers 23 which are welded at 28 to said flanges of said stifleners and at 29 to the floor plates.

From the foregoing it is seen that the double bottom construction for vessels consisting of transverse inverted channels supported as shown and described provides a double bottom for bulk-cargo carrying vessels of great rigidity and strength against clam-shell bucket bumping action besides a reduction in weight of material used resulting in a saving in the original cost of construction and also in repairs.

Having fully described my invention, what I claim is:

In a double bottom construction for vessels, the combination of a bottom shell plating, a side shell plating, a center keelson, floor plates, the floor plates extending outboard in transverse alinement from opposite sides of the center keelson to the side shell plating, the floor plates being uniformly spaced apart from fore to aft, margin plates supported by the outboard bilge ends of said floor plates, channels forming the top of the double bottom, the channels being inverted and having their flanges in side-by-side contact, said channels extending transversely from one margin plate to the other, means securing said channels to each other and to said margin plates, every other one of said channels resting upon and fixed upon said floor plates, vertical angle stifieners welded to said floor plates at uniform distances apart, the floor plates having longitudinal notches in alinement with said stitfeners, stringers supported in said notches of the floor plates and welded to said stitfeners, the stringers having transverse notches for receiving the sideby-side contact flanges of said channels, and said stringers being welded to said channels and supporting same.

References Cited in the file of this patent UNITED STATES PATENTS 1,658,336 Isherwood Feb. 7, 1926 1,823,081 Bartenfeld Sept. 15, 1931 2,520,024 Bartenfeld Aug. 22, 1950 FOREIGN PATENTS 142,944 Great Britain May 19, 1920 344,377 Great Britain May 2, 1931 

